Etat du microbiote chez certains poissons, cas du Rouget (Mullus barbatus, Linnaeus, 1758) et du Merlu (Merluccius merluccius (Linnaeus, 1758).

Abstract

The non-pathogenic bacterial flora or microbiota present in aquatic products is poorly described in the scientific literature. The few studies have shown that the environment such as temperature and salinity impacts the composition of this bacterial flora. The seasons have been shown to influence the composition of bacterial flora in fish. Indeed, fish, molluscs and crustaceans are animals whose internal temperature is variable and therefore the bacterial flora associated with these animals is also dependent on the temperature of the environment. Most studies focus on the digestive tract of farmed fish and its role in aquaculture on fish growth. The decimal dilutions carried out from the stock solution obtained from the various grindings respectively of the organ fragments of Mucus, Gills, and the muscle flesh of the two fish, red mullet and hake, made it possible to carry out microbiological cultures of a bacteriological nature. This work focused on bacteriological culture using nutrient agar as culture medium, the colony count calculation method, and various biochemical tests, such as the catalase test and the oxidase test. The results were seen on the one hand by a very large number of bacterial colonies. In parallel, the phenotypic pre-identification is considered especially by the genera, Pseudomonas, Aeromonas sp, and the Enterobacteriaceae generally represented by Escherichia, Enterobacter, Klebsiella, Serratia and Citrobacter.